Fan unit designed as an air treatment device in an air conditioning aggregate

ABSTRACT

An air conditioning aggregate with a built-in fan unit comprising a radial fan, an electric drive motor and a power transmission therebetween, the radial fan being secured with its plane-parallel end walls in a framework of the air conditioning aggregate, the greatest length dimension of said frame work extending in a direction perpendicular to the ejection aperture of the fan, the electric drive motor being mounted on one side of the fan housing of the radial fan, while the power belt transmission extends between rope-belt pulleys on the two parallel axles of fan and motor.

United States Patent [191 Astrom [54] FAN UNIT DESIGNED AS AN AIRTREATMENT DEVICE IN AN AIR CONDITIONING AGGREGATE [75] Inventor: LennartAstrom, 130 11 Saltsjo- Duvnas, Sweden [73] Assignee: AktiebolagetSvenska Flaktfabriken,

Nacka, Sweden [22] Filed: May 20, 1971 [21] App1.No.: 145,349

[30] Foreign Application Priority Data May 29, 1970 Sweden ..7500/7O[52] US. Cl ..417/423 R, 415/126, 415/219 [51] Int. Cl ..F04b 17/00 [58]Field of Search ..4l7/423 R, 424;

[56] 'References Cited UNITED STATES PATENTS Euwermn ..417/423 R [451Apr. 10, 1973 2,464,473 3/1949 Wessel ..4l7/423 R 2,693,914 11/1954Payne 2,282,373 5/1942 Minkler et a1 ..4l7/423 R X FOREIGN PATENTS ORAPPLICATIONS 610,021 lO/l926 France ..4lS/l26 Primary Examiner-C. J.Husar Attorney1-Iowson & Howson [5 7] ABSTRACT An air conditioningaggregate with a built-in fan unit comprising a radial fan, an electricdrive motor and a power transmission therebetween, the radial fan beingsecured with its plane-parallel end walls in a framework of the airconditioning aggregate, the greatest length dimension of said frame workextending in a direction perpendicular to the ejection aperture of thefan, the electric drive motor being mounted on one side of the fanhousing of the radial fan, while the power belt transmission extendsbetween rope-belt pulleys on the two parallel axles of fan and motor.

3 Claims, 4 Drawing Figures PATENTEDAPRI 1 3', 726,61 1

sum 1 BF 2 Fig. la

Fig. lb

Fig. 7c

Lsgmg KT A 51123" IN VEN TOR.

PATENTEU APR] 0 I975 SHEET 2 OF 2 INVENTOR. LEWARr Aswan BY WWW FAN UNITDESIGNED AS AN AIR TREATMENT DEVICE IN AN AIR CONDITIONING AGGREGATEThis invention relates to a fan unit intended to be built-in as an airtreatment device within the casing of an air conditioning aggregate andcomprising a radial fan, an electromotor and a power transmissiontherebetween.

Such air treatment devices are usually provided with a belt-drivendouble-throat radial fan built-in in direct connection to other airtreatment components in such a manner, that the casingacts as a suctionbox for the fan. This necessitates that it must be possible to directthe fan outlet not only in the longitudinal direction of the device, butalso upwardly and downwardly.

In a conventional construction the motor and the fan were placed oneafter the other in the longitudinal direction of the device, and thehorizontal axles were oriented perpendicularly to said direction. Inthis conventional construction the three aforementioned different outletdirections are obtained in such a way that the fan is turned while thefan axle maintains its horizontal orientation. The projection of the fanonto a plane perpendicular to the longitudinal direction of the deviceis substantially smaller than the cross-section determined by the designof the remaining components.

In the above described construction, thus, valuable space is lost forthe motor in the longitudinal direction of the device, in spite of thefact that sufficient motor space is available in the plane of the fanlocation.

The invention has as its object a new and improved embodiment of a fanunit in which the aforesaid disadvantage is eliminated, partly bysecuring the radial fan with its plane-parallel end walls in aframe-work extending with its greatest length dimension corresponding tothe depth of the fan housing, counted from the ejection aperture andpartly by mounting the electric drive motor directly on one side of thehousing of the radial fan, and by arranging a power transmission in theform of a belt transmission extending between ropebelt pulleys on thetwo'parallel axles of fan and motor.

According to the preferred embodiment, the electric drive motor of thefan unit is mounted on the plane part of the fan housing. When arrangedto eject the air longitudinally from the device both the radial fan andthe electric drive motor are provided with vertical axles. When arrangedeither with an upwardly or with a downwardly directed fan outlet, theabove described unit is turned 90 upwardly r downwardly about animaginary axis of perpendicular orientationrelative to the longitudinaldirection of the fan unit.

The invention is described in greater detail below, with reference tothe accompanying drawings, in which FIGS. la, lb, and 1c are schematicviews of a fan unit of the novel construction arranged with alongitudinally, an upwardly, and a downwardly directed fan outletrespectively; and

FIG. 2 shows an exemplifying embodiment of a fan unit with astraight-blowing or longitudinally-directed fan outlet.

Referring to the drawing, FIG. 2, the conditioning device is designatedby 1. Said device comprises a fan 2, an electric drive motor 4 and apower transmission 5 shown as a V-belt stretched between two V-beltpulleys 10, 11 mounted on the end of the vertical axle V of the motorand the vertical axle V" of the radial fan 2a. The housing ofthe fan 2has parallel end walls 6 and 7, each having an inlet throat foradmitting air to the center of the fan rotor 2a, and an involute wallsurrounding said rotor and terminating in a generally tangential planeextension 8 defining one side of the outlet throat or ejection aperture9.

According to the invention, an open framework 3 is provided with itsgreatest length dimension L corresponding to the depth of the involutefan housing, counted from the ejection aperture 9. A standard 12 mountsthe fan 2, drive motor 4 and transmission 5 as a unitary aggregatewithin the open-sided framework 3, as shown. FIG. 2 shows the basicdesign with a straightblowing fan, i.e., the fan unit blows theventilation air treated in other parts of the air conditioning devicelongitudinally in the direction of the arrows.

In the embodiment shown, the electric drive motor is not mounteddirectly on the plane portion 8 of the fan housing, but instead on abracket 4a, which by a displaceable bar 4b can be moved on a plate 4dfastened adjacent the plane portion 8 of the fan housing for the fanunit. For adjusting the tension of the power transmission 5, thedistance between the axles V and V" can be changed in known manner bythe screws 40.

H H" designates the imaginary axis about which the conditioningaggregate is turned within the framework 3 in cases when an upwardly ordownwardly directed ejection from the fan 2 is intended. As shown inFIGS. 1a, 1b, and 1c, when the aggregate is turned about the axis H H",the ejection aperture 9 remains in its center position between the frontand the back of the framework, and the motor 4 remains readilyaccessible for service at the front side of the open framework.

What is claimed is:

l. A fan unit intended to be built-in within the casing of an airconditioning aggregate as an air treatment device comprising a radialfan, an electric drive motor and a power transmission therebetween, saidradial fan comprising a fan rotor having radial blades disposedcircumferentially there-about a pair of plane parallel end walls eachhaving an inlet throat therein, said rotary fan rotor having itscircumferential blades mounted between said end walls of circumscribingsaid inlet throats, and an involute wall partially surrounding saidrotor and terminating in a generally tangential plane extension definingoneside of the ejection aperture of said fan, the improvement whereinsaid unit includes an open-sided framework, the length dimension ofwhich corresponds to the depth of the fan housing counted along saidparallel end walls from the ejection aperture, means mounting theelectric drive motor at one side of the fan housing adjacent said planeextension with the axle of the motor parallel to the axle of the fanrotor, the power transmission being in the form of a belt transmissionextending between rope-belt pulleys on the two parallel axles, and astandard adapted to mount said fan, motor and transmission aggregatewithin said open-sided framework with their axles vertical topositionsaid ejection aperture horizontal longitudinally of saidframework, and said motor at the front side of the framework.

2. A fan unit according to claim 1 characterized in that the fan, motorand transmission aggregate is tion aperture is positioned centrallybetween the front and back sides of said framework, the motor axle beingpositioned forwardly of the vertical longitudinal center plane of thecasing and the fan axle being positioned rearwardly of said longitudinalcenter plane.

1. A fan unit intended to be built-in within the casing of an airconditioning aggregate as an air treatment device comprising a radialfan, an electric drive motor and a power transmission therebetween, saidradial fan comprising a fan rotor having radial blades disposedcircumferentially there-about a pair of plane parallel end walls eachhaving an inlet throat therein, said rotary fan rotor having itscircumferential blades mounted between said end walls of circumscribingsaid inlet throats, and an involute wall partially surrounding saidrotor and terminating in a generally tangential plane extension definingone side of the ejection aperture of said fan, the improvement whereinsaid unit includes an open-sided framework, the length dimension ofwhich corresponds to the depth of the fan housing counted along saidparallel end walls from the ejection aperture, means mounting theelectric drive motor at one side of the fan housing adjacent said planeextension with the axle of the motor parallel to the axle of the fanrotor, the power transmission being in the form of a belt transmissionextending between rope-belt pulleys on the two parallel axles, and astandard adapted to mount said fan, motor and transmission aggregatewithin said open-sided framework with their axles vertical to positionsaid ejection aperture horizontal longitudinally of said framework, andsaid motor at the front side of the framework.
 2. A fan unit accordingto claim 1 characterized in that the fan, motor and transmissionaggregate is adapted to be turned 90* either upwardly or downwardlyabout a horizontal, imaginary axis of perpendicular orientation relativeto the longitudinal direction of the fan unit, to thereby position saidejection aperture vertical and said motor at said front side of theframework.
 3. A fan unit according to claim 1 wherein said ejectionaperture is positioned centrally between the front and back sides ofsaid framework, the motor axle being positioned forwardly of thevertical longitudinal center plane of the casing and the fan axle beingpositioned rearwardly of said longitudinal center plane.